title: The cytogenetic boundaries of the rDNA region within heterochromatin in the X chromosome of Drosophila melanogaster and their relation to male meiotic pairing sites.
mesh_terms: D000818:Animals; D001483:Base Sequence; D007446:Chromosome Inversion; D004247:DNA / Q000032:analysis*; D004331:Drosophila melanogaster / Q000235:genetics*; D005260:Female; D005796:Genes; D006570:Heterochromatin / Q000648:ultrastructure*; D008297:Male; D012335:RNA, Ribosomal / Q000235:genetics*; D012730:Sex Chromosomes / Q000648:ultrastructure*; D014960:X Chromosome / Q000648:ultrastructure*
chemical_list: D006570:Heterochromatin; D012335:RNA, Ribosomal; D004247:DNA